Offline Controllers | NCP1379

Controller, Quasi-Resonant, Current Mode

Obsolete

Datasheet

Products

Overview

The NCP1379 is a high performance device aimed at powering quasi-resonant converters. Capitalizing on a proprietary valley lockout system, the controller shifts gears and reduces the switching frequency as the power loading becomes lighter. This results in a stable operation despite switching events always triggering in the drain-source valley. This system works down to the 4th valley and toggles to a variable frequency mode beyond, ensuring an excellent standby power performance. To improve the safety in the overload situations, the controller includes an Over Power Protection (OPP) circuit which clamps the delivered power at high-line. Safety-wise, a fixed internal timer relies on the feedback voltage to detect a fault. Once the timer elapses, the controller stops and enters auto-recovery mode, ensuring a low duty-cycle burst operation. Particularly well suited for TV power supply applications, the controller features a low startup voltage allowing use of an auxiliary supply to power the device.

  • Auxiliary power supplies (flat TV, appliances)

  • Power AC-DC converters for adapters, TVs and set top boxes

  • Quasi-resonant peak current mode control operation
  • Valley switching operation with valley lockout
  • Frequency foldback at light load
  • Adjustable overpower protection
  • Auto-recovery output short circuit protection
  • Fixed internal 80 ms timer for short circuit protection
  • VCC range operation up to 28 V

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ON Target

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Control Mode

fsw Typ (kHz)

Stand-by Mode

UVLO (V)

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Reference Price

NCP1379DR2G

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Obsolete

CAD Model

Pb

A

H

P

SOIC-8

751-07

1

260

REEL

2500

N

Flyback

Current Mode

Variable

Yes

9

Yes

Yes

Yes

28

500 / 800

Price N/A

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Reliability Data

Die Related Summary Data

Device: NCP1379DR2G

Equivalent to wafer fab process: VHVIC

Product Technology

Product Technology

Equivalent Device-Hours

MTBF/MTTF in Hours

FITS

VHVIC

2

2577173853

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Re-calculate Data

Data is based on the following assumptions.

Note: The temperature and confidence level may be adjusted to your requirements.

Disclaimer: A reliability FIT rate calculated using this tool shall not be used for any functional safety purpose. In case a raw FIT rate needs to be estimated for a component which is targeted to be used in a safety critical application (i.e. compliant to ISO 26262 standard) it should be calculated according to generic safety standards (IEC62380, IEC61709, SN29500, FIDES, etc.)

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